Update postgres
Update postgres

Changes:

- https://github.com/docker-library/postgres/commit/e521526: Remove "backwards compatibility" entrypoint symlink in 12+
- https://github.com/docker-library/postgres/commit/03db72f: Remove UUID variability now that 9.3 is gone (per comment in "update.sh")
- https://github.com/docker-library/postgres/commit/59e5a64: Merge pull request https://github.com/docker-library/postgres/pull/568 from infosiftr/pr-309
- https://github.com/docker-library/postgres/commit/85aadc0: Move end of line comment to its own line to improve readability

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